<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      var obj = { name: "张三", age: 22, height: "178cm" };
      var str = [];
      for (var key in obj) {
        // console.log(key, obj[key]);
        var res = key + "=" + obj[key];
        // console.log(res);
        str.push(res);
        var newstr = "?" + str.join("&");
      }
      console.log(newstr);
    </script>
  </body>
</html>
